Health Canada says it’s advising people to stay indoors and away from public places for the next two days.
The warning comes a day after a new coronaviruses case in Colorado and after a second one in Arizona.
Both cases have now been linked to the Colorado outbreak.
Arapahoes and Metrolinas Health Department are recommending people stay home.
They say that is a precaution to protect against spreading the new coronax virus to people who may have not yet been exposed to the virus.
Metrolinas spokesman Chris Beaulieu says people are advised to avoid contact with people who are infected with the new virus.
He says the community is safe.
Metrolina said it has also issued a public health alert for residents in the northern part of the state.
Beaulio says it will continue to monitor the situation.
Arapahs Health Department said it is also advising people in the metro area to stay home, even though temperatures are falling and they are seeing fewer people coming into the city.
Beauhelieu says the cold weather is helping the outbreak spread.
The Denver Post reported Wednesday that a Colorado man had contracted the new strain and tested positive for coronaviral disease.
The suspect in the Colorado case, a 29-year-old man, has been hospitalized with symptoms, including fever and cough, and has tested positive again.
The man, whose name has not been released, was released after being treated at an area hospital, said a spokesman for the state Department of Public Health and Environment.
The Denver Police Department has reported a second person in Arizona has tested negative for the new pandemic strain.
The two cases in Arizona are believed to be linked, but beaucoup tests are still ongoing.
The Arizona Department of Health and Human Services says it is still determining the nature of the virus and is urging people to limit outdoor activities.